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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async (t) => {
let start_length = navigation.entries().length;
let start_index = navigation.currentEntry.index;
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
await new Promise(r => window.onload = () => t.step_timeout(r, 0));
await navigation.navigate("#1").finished;
assert_equals(navigation.entries().length, start_length + 1);
let iframe = document.createElement("iframe");
iframe.src = "/common/blank.html";
document.body.appendChild(iframe);
await new Promise(r => iframe.onload = () => t.step_timeout(r, 0));
assert_equals(iframe.contentWindow.navigation.entries().length, 1);
// Go back to before the iframe was added. The iframe will still be in the
// document, but we will be at a joint session history entry that was created
// before the iframe was added to the document.
await navigation.back().finished;
assert_equals(navigation.entries().length, start_length + 1);
assert_equals(iframe.contentWindow.navigation.entries().length, 1);
assert_equals(navigation.currentEntry.index, start_index);
assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
// A push navigation in the top window will truncate-then-push the joint
// session history. This should dispose the forward entry in the top window,
// but should not interfere with the currentEntry in the iframe.
let dispose_promise = new Promise(r => navigation.entries()[start_index + 1].ondispose = r);
iframe.contentWindow.navigation.currentEntry.ondispose = t.unreached_func("iframe entry must not be disposed");
await navigation.navigate("#b").finished;
await dispose_promise;
assert_equals(navigation.entries().length, start_length + 1);
assert_equals(iframe.contentWindow.navigation.entries().length, 1);
assert_equals(navigation.currentEntry.index, start_index + 1);
assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
}, "Removing a currentEntry from the joint session history shouldn't dispose it");
</script>
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